Before the env-size property was introduced, the solution was to wrap
the nvmem-layout in a correctly sized partition.
Remove now that it's not needed.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22367
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>